Flow rate unit conversions and device class

[elupus]

Proposed change

• Add ability to convert between flow rates
• Add device class for flow rates
• Correct units for flow rates from ft³/m to ft³/min

Based on home-assistant/architecture#915

Missing (help accepted):

• frontend icon PR
• number+sensor dev docs PR
• number+sensor regular docs PR

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Add volume flow rate conversions #93828, Add volume flow rate conversions #93828, 'm³/h' and 'MJ' is not valid data type for device class ('gas') - (warning) #85905
• Link to documentation pull request: Add volume flow rate device class developers.home-assistant#2034 Volume flow rate device class home-assistant.io#30748 Add volume flow rate frontend#19344

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
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• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

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• Documentation added/updated for www.home-assistant.io

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  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

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[emontnemery]

number and sensor tests which test unit conversion should also be updated

[emontnemery]

Looks good 👍

We should consider the name UnitOfVolumetricFlowRate since we already have UnitOfVolumetricFlux though

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[emontnemery]

Thanks, @elupus 👍